/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraParameterMapHistory.h
Is this parameter in the special "System" namespace?
namespace FNiagaraParameterUtilities { bool FNiagaraParameterUtilities::IsSystemParameter ( const [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) & InVar ) }